How to unlock my phone to use on any carrier?

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Jul 30, 2011
I currently have Verizon Wireless. I would like to call up AT&T TeleSales to see if they could approve me for a line of service without a deposit which I'm pretty sure they would charge me based on credit, but if my credit is good, and they don't require a deposit then I would like too unlock my iPhone to use on any carrier. Would this be possible, and if so, how would it be done? I did do a JB using redsn0w. I have the iPhone 4 with iOS 5.1.1.

BTW, does everyone prefer AT&T over Verizon?

Thank you!